Actuator

a technology of actuators and actuators, applied in the field of actuators, can solve the problems of reducing the lifetime affecting the operation of the actuation coil, and causing the illusion of inaccurately redirecting light, so as to reduce the amount of material required, reduce the electrical coupling, and reduce the effect of production costs

Active Publication Date: 2014-12-04
GOOGLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0046]The actuator may further comprise one or more spacing regions which are arranged between the support frame and second support frame. The space regions may be configured to reduce the electrical coupling between one or more coils on the support frame and one or more coils on the second support frame. Furt

Problems solved by technology

Warp will cause distortion of mirror which ultimately causes the mirror to inaccurately redirect light, during operation.
However, it has not been recognised in the art, that oscillation of the support frame can also impart stress on the actuation coil.
These stresses can cause ware and tare of the actuation coil and will ultimately reduce

Method used

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Examples

Experimental program
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Embodiment Construction

[0058]FIG. 1 shows an aerial view of an electromagnetic actuator 1 according to an embodiment of the present invention. The electromagnetic actuator 1 comprises a movable member 3. The movable member 3 comprises a support frame 5 which is configured such that it can oscillate about a first oscillation axis 7 and a mirror 9 which is fixed to the support frame 5 such that oscillation of the support frame 5 will effect oscillation of the mirror 9. The mirror 9 is fixed to the support frame 5 by means of connectors 4. The support frame 5 oscillates by means of torsional bars 10a, 10b which cooperate respectively with fixed portions 8a, 8b of the electromagnetic actuator 1.

[0059]The electromagnetic actuator 1 comprises an actuation coil 11, which cooperates with the support frame 5. It will be understood that the support frame 5 could be arranged in any other configuration; for example, the support frame could be arranged in a circular or oval configuration. The actuation coil 11 is arra...

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PUM

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Abstract

According to the present invention there is provided an actuator comprising, a movable member, the movable member comprising a support frame which is configured such that it can oscillate about a first oscillation axis and a mirror which is fixed to the support frame such that oscillation of the support frame will effect oscillation of the mirror; an coil, which cooperates with the support frame; one or more boundary portions provided between the support frame and the mirror which reduce the influence of warp transmitted from an edge of the support frame to the mirror, as the support frame oscillates about the first oscillation axis; wherein the support frame further comprises one or more cut-out regions, wherein the one or more cut-out regions are configured to be parallel to at least a portion of the coil, to reduce stress on the coil as the support frame oscillates about the first oscillation axis and/or to reduce the temperature dependence of the properties of the actuator.

Description

FIELD OF THE INVENTION[0001]The present invention concerns an actuator, in particular, but not exclusively, to an actuator which operates by applying an actuating signal to an actuation coil which cooperates with a support frame to effect oscillation of a support frame, wherein the support frame comprises cut-out regions which reduce stress on the actuation coil as the support frame oscillates and / or which reduce the temperature dependence of the actuator.DESCRIPTION OF RELATED ART [0002]Typically electromagnetic actuators which are used to oscillate mirrors, such as micro-mirrors, comprise a movable support frame on which the mirror is supported. The movable support frame is configured such that it can oscillate about an oscillation axis. An actuation coil cooperates with the support frame; the actuation coil is arranged such that it is submerged in a magnetic field provided by a magnetic component in the electromagnetic actuator. An actuation signal, which is typically in the form...

Claims

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Application Information

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IPC IPC(8): H02K9/22H02K33/00G02B26/08
CPCH02K9/22H02K33/00G02B26/08B81B3/0072G02B26/085B81B2201/038B81B2201/042B81B2203/058H02K9/227H02K33/02H02K33/16
Inventor GAMET, JULIENKHECHANA, FAOUZI
Owner GOOGLE LLC
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